Question Monitor going black after 1 second, still on

Aug 3, 2021
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So, this happened randomly today. My monitor randomly went black after a second of powering on, the lights at the bottom of the screen are still on (on the buttons) and the same thing happens when plugging in the monitor on my brother's computer with his own HDMI cable. What causes this and how can I fix it?

The monitor is the Acer H233H.
 

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